CodeEval - Minesweeper - Hard

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;


public class Main {
    public static void main (String[] args) throws FileNotFoundException, IOException {

    BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
    StringBuffer sb=new StringBuffer();
    String line;
    while ((line = in.readLine()) != null) {
        StringTokenizer st=new StringTokenizer(line,";");
        StringTokenizer st2=new StringTokenizer(st.nextToken(),",");
        int n=Integer.parseInt(st2.nextToken());
        int m=Integer.parseInt(st2.nextToken());
        StringBuilder str=new StringBuilder(st.nextToken());
        int[][]arr=new int[n+2][m+2];
        char[][]val=new char[n+2][m+2];
        for(int i=1;i<n+1;i++){
            for(int j=1;j<m+1;j++){
                val[i][j]=str.charAt(0);
                if(val[i][j]=='*'){
                    inc(arr, i, j);
                }
                str.deleteCharAt(0);
            }
        }
        for(int i=1;i<n+1;i++){
            for(int j=1;j<m+1;j++){
                if(val[i][j]=='*'){
                    sb.append(val[i][j]);
                }else{
                   sb.append(arr[i][j]);
                }
            }
        }
        sb.append('\n');
    }
    System.out.print(sb);
  }
   
    static void inc(int[][]arr,int x,int y){
        for(int i=x-1;i<x+2;i++){
            arr[i][y-1]++;
            if(i!=x)
                arr[i][y]++;
            arr[i][y+1]++;
        }
    }
}